Alas, my tub troubles...

I am in love with my bathtub. For an amusing back story on this see this previous entry. Problem is that I find I use my tub less now because the drain stop is broken. It will not stay open unless you manually hold the latch. But is too painful for me to stand or even sit there holding the latch open while it drains. So I use it less and less. Anyone with plumbing skills able to help me out?